* {
  margin: 0;
  padding: 0;
}
li {
  list-style: none;
}
a {
  text-decoration: none;
  color: black;
}
.w {
  width: 1200px;
  margin: 0 auto;
}
.top {
  display: flex;
  justify-content: space-between;
  color: #000;
  height: 45px;
  background-color: rgba(255, 255, 255, 0.7);
  box-shadow: 0 0 15px #747474;
  position: fixed;
  width: 100vw;
}
.top .logo {
  width: 8vw;
  background-color: #422f2f;
  color: white;
  text-align: center;
  line-height: 35px;
  border-radius: 20px;
  margin: 5px;
}
.top .nav {
  width: 30vw;
}
.box {
  width: 800px;
  margin: 150px auto;
}
.timeline {
  list-style: none;
}
.timeline li {
  border-left: 2px solid skyblue;
  position: relative;
  padding: 15px;
}
.timeline li:first-child::after {
  transform: scale(1.5);
  border-color: hotpink;
}
.timeline li::after {
  box-sizing: border-box;
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 3px solid blueviolet;
  background-color: #fff;
  left: -8px;
  top: 0;
}
.timeline li:hover::after {
  border-color: red;
}
.null_box {
  height: 150px;
}
.box {
  margin: 0 auto;
  width: 800px;
}
.box {
  font-size: 14px;
}
.title {
  padding-top: 10px;
  transition: all 0.5s;
}
li > a {
  display: block;
  text-decoration: none;
  color: black;
}
li:hover .title {
  color: #46b9ae;
  transform: translateX(20px);
}
.timeline li img {
  float: left;
  width: 80px;
  margin-right: 15px;
}
